Merge Multiple PDF's into one PDF

Question

I am having some issues with my code. I am trying to loop through a Drive folder that contains many PDFs and then merge these into one file. When I use my code it just creat

Answer 1

Here's the code to concatenate the blobs, but like Serge mentioned, it doesn't actually work, and the PDF comes out corrupt.

function MergeFiles(){
var folder = DocsList.getFolderById('myFolderID'); 
var files = folder.getFiles(); 

var blobs = "";    
for( var i in files )   
blobs=blobs+(files[i].getBlob().getBytes());
Logger.log(blobs);
var myPDF = Utilities.newBlob(blobs, "application/pdf", "newPDF.pdf");
folder.createFile(myPDF);

    }